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CORPORATE PRESENTATION - Investor Relations ...
C O R PO RAT E PR ESEN TAT ION
                        MAY 2021
CORPORATE PRESENTATION - Investor Relations ...
NOTE REGARDING FORWARD-LOOKING STATEMENTS & NON-GAAP
FINANCIAL MEASURES
This presentation includes forward-looking statements that involve risks and uncertainties relating to future events and the future performance of Regeneron Pharmaceuticals, Inc. (“Regeneron” or the “Company”), and actual events or results may differ
materially from these forward-looking statements. Words such as “anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” variations of such words, and similar expressions are intended to identify such forward-looking statements, although not all
forward-looking statements contain these identifying words. These statements concern, and these risks and uncertainties include, among others, the impact of SARS-CoV-2 (the virus that has caused the COVID-19 pandemic) on Regeneron's business and
its employees, collaborators, and suppliers and other third parties on which Regeneron relies, Regeneron's and its collaborators’ ability to continue to conduct research and clinical programs, Regeneron's ability to manage its supply chain, net product sales
of products marketed or otherwise commercialized by Regeneron and/or its collaborators (collectively, ”Regeneron’s Products“), and the global economy; the nature, timing, and possible success and therapeutic applications of Regeneron’s Products and
product candidates being developed by Regeneron and/or its collaborators (collectively, “Regeneron’s Product Candidates”) and research and clinical programs now underway or planned, including without limitation EYLEA® (aflibercept) Injection, Dupixent®
(dupilumab), Libtayo® (cemiplimab), Praluent® (alirocumab), Kevzara® (sarilumab), EvkeezaTM (evinacumab), InmazebTM (atoltivimab, maftivimab, and odesivimab-ebgn), REGEN-COV™ (casirivimab with imdevimab), fasinumab, garetosmab, pozelimab,
odronextamab, itepekimab, REGN5458, REGN5713-5714-5715, Regeneron’s other oncology programs (including its costimulatory bispecific portfolio), Regeneron’s and its collaborators’ earlier-stage programs, and the use of human genetics in
Regeneron’s research programs; safety issues resulting from the administration of Regeneron’s Products and Regeneron’s Product Candidates in patients, including serious complications or side effects in connection with the use of Regeneron’s Products
and Regeneron’s Product Candidates in clinical trials; the likelihood, timing, and scope of possible regulatory approval and commercial launch of Regeneron’s Product Candidates and new indications for Regeneron’s Products, including without limitation
those listed above; the likelihood and timing of achieving any of the anticipated milestones described in this presentation; the extent to which the results from the research and development programs conducted by Regeneron and/or its collaborators may be
replicated in other studies and/or lead to advancement of product candidates to clinical trials, therapeutic applications, or regulatory approval; ongoing regulatory obligations and oversight impacting Regeneron’s Products (such as EYLEA, Dupixent,
Libtayo, Praluent, Kevzara, Evkeeza, and Inmazeb), research and clinical programs, and business, including those relating to patient privacy; determinations by regulatory and administrative governmental authorities which may delay or restrict Regeneron’s
ability to continue to develop or commercialize Regeneron’s Products and Regeneron’s Product Candidates; competing drugs and product candidates that may be superior to, or more cost effective than, Regeneron’s Products and Regeneron’s Product
Candidates; uncertainty of the utilization, market acceptance, and commercial success of Regeneron’s Products and Regeneron’s Product Candidates and the impact of studies (whether conducted by Regeneron or others and whether mandated or
voluntary) or recommendations and guidelines from governmental authorities and other third parties on the commercial success of Regeneron’s Products and Regeneron’s Product Candidates; the availability and extent of reimbursement of Regeneron’s
Products from third-party payors, including private payor healthcare and insurance programs, health maintenance organizations, pharmacy benefit management companies, and government programs such as Medicare and Medicaid; coverage and
reimbursement determinations by such payors and new policies and procedures adopted by such payors; the ability of Regeneron to manufacture and manage supply chains for multiple products and product candidates; the ability of Regeneron’s
collaborators, suppliers, or other third parties (as applicable) to perform manufacturing, filling, finishing, packaging, labeling, distribution, and other steps related to Regeneron’s Products and Regeneron’s Product Candidates; unanticipated expenses; the
costs of developing, producing, and selling products; the ability of Regeneron to meet any of its sales or other financial projections or guidance and changes to the assumptions underlying those projections or guidance; risks associated with intellectual
property of other parties and pending or future litigation relating thereto (including without limitation the patent litigation and other related proceedings relating to EYLEA, Dupixent, Praluent, and REGEN-COV), other litigation and other proceedings and
government investigations relating to the Company and/or its operations, the ultimate outcome of any such proceedings and investigations, and the impact any of the foregoing may have on Regeneron’s business, prospects, operating results, and financial
condition; and the potential for any license or collaboration agreement, including Regeneron’s agreements with Sanofi, Bayer, and Teva Pharmaceutical Industries Ltd. (or their respective affiliated companies, as applicable), as well as Regeneron's
agreement with Roche relating to the casirivimab with imdevimab antibody cocktail (known as REGEN-COV in the United States), to be cancelled or terminated. A more complete description of these and other material risks can be found in Regeneron’s
filings with the U.S. Securities and Exchange Commission. Any forward-looking statements are made based on management’s current beliefs and judgment, and the reader is cautioned not to rely on any forward-looking statements made by Regeneron.
Regeneron does not undertake any obligation to update (publicly or otherwise) any forward-looking statement, including without limitation any financial projection or guidance, whether as a result of new information, future events, or otherwise.
This presentation uses non-GAAP net income per share, or non-GAAP EPS, and net cash, which are financial measures that are not calculated in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”). These and other non-GAAP
financial measures are computed by excluding certain non-cash and other items from the related GAAP financial measure. Non-GAAP adjustments also include the income tax effect of reconciling items. The Company makes such adjustments for items the
Company does not view as useful in evaluating its operating performance. For example, adjustments may be made for items that fluctuate from period to period based on factors that are not within the Company’s control, such as the Company’s stock price
on the dates share-based grants are issued. Management uses non-GAAP measures for planning, budgeting, forecasting, assessing historical performance, and making financial and operational decisions, and also provides forecasts to investors on this
basis. Additionally, non-GAAP measures provide investors with an enhanced understanding of the financial performance of the Company’s core business operations. However, there are limitations in the use of non-GAAP financial measures as they
exclude certain expenses that are recurring in nature. Furthermore, the Company’s non-GAAP financial measures may not be comparable with non-GAAP information provided by other companies. Any non-GAAP financial measure presented by
Regeneron should be considered supplemental to, and not a substitute for, measures of financial performance prepared in accordance with GAAP. A reconciliation of the non-GAAP financial measures used in this presentation is provided on slide 28.

                             ®
CORPORATE PRESENTATION - Investor Relations ...
A DIVERSIFIED GROWTH STORY

Strong and Growing Core         Entering a Period of New
                                                                                   A Broad and Diverse Pipeline
        Brands                         Launches

                              1L Non-Small Cell Lung Cancer and
                                                                                        Dupixent in pivotal trials for
                                    Basal Cell Carcinoma                                            8 Type 2 diseases

                                       Pediatric Asthma                              Advancing immuno-oncology
                                                                                        pipeline and combinations

                                         COVID-19
                                                                                     ~30 Therapeutic candidates in
                                                                                                   clinical development
                                    Homozygous Familial
                                 Hypercholesterolemia (HoFH)

                                                                                                                                                     3
                                                           This slide contains investigational products not yet approved by regulatory authorities
CORPORATE PRESENTATION - Investor Relations ...
STRONG EXECUTION IN 1Q 2021

                                                                                                                                              R&D Pipeline Advancements
                                                                                                                                                                                         Pediatric Asthma
                                                                                                                                                                                         (PDUFA 10/21/21)

                                                                                                                                                                                         Now Approved in 1L
                                                                                                                                                                                         NSCLC and BCC

 1Q Total Revenues,                                                       +38%                                                                                                           Obtained exclusive rights to
                                                                                                                                                                                         MUC16xCD3 & BCMAxCD3
        YoY*                                                                 growth
                                                                                                                                                                                         Now Approved in HoFH

 1Q Non-GAAP EPS,                                                        +50%                                                                                                            Multiple positive data releases
       YoY*                                                                  growth
                                                                                                                                                                                         from Treatment and
                                                                                                                                                                                         Prevention trials

                                                                                                                     BCC – Basal Cell Carcinoma; NSCLC – Non-Small Cell Lung Cancer;
 YoY – Year-over-year; *1Q21 vs. 1Q20; See reconciliation of non-GAAP net income to GAAP net
                                                                                                                     HoFH –Homozygous Familial Hypercholesterolemia; PDUFA – Prescription Drug User Fee Act       4
 income and non-GAAP EPS to GAAP EPS on slide 28                                               This slide contains investigational products not yet approved by regulatory authorities
CORPORATE PRESENTATION - Investor Relations ...
EYLEA, DUPIXENT, AND LIBTAYO ARE CORE TO DIVERSIFIED GROWTH
STRATEGY; SPECIALIZED PROGRAMS OFFER ADDITIONAL GROWTH POTENTIAL

                                                                                                                                                      Specialized growth
                EYLEA                                                Dupixent*                     Oncology                                             opportunities:

                                                                                                                                                           Infectious Disease
  • Execute and grow in wet                                   • Transform treatment of      • Realize potential
                                                                                                                                                           COVID-19^ & Ebola
    AMD and diabetic eye                                        Type 2 inflammatory           for best-in-class
                                                                                                                                                            Antibody Cocktails
    diseases                                                    diseases                      immunotherapy
                                                                                              treatments
  • Explore high-dose                                         • Realize full potential in                                                                   Rare Disease
    formulation for less                                        AD, asthma and CRSwNP       • Compete, Enhance, and                                       HoFH, C5-mediated
    frequent dosing                                                                           Extend benefits of                                              diseases
                                                              • Execute broad Ph3 & Ph4       immunotherapy to broader
  • Pursue gene therapy and                                     development program           patient populations
    other novel approaches                                                                                                                                  Allergic Disease
                                                                                                                                                                Cat, Birch

 AMD – Age-Related Macular Degeneration; AD – Atopic
 Dermatitis; CRSwNP – Chronic Rhinosinusitis with Nasal                                               * In collaboration with Sanofi
 Polyposis; HoFH – Homozygous familial hypercholesterolemia                                           ^ In collaboration with Roche                                                             5
                                                                                                      This slide contains investigational products not yet approved by regulatory authorities
EYLEA®: EXTENDING LEADERSHIP POSITION
Setting a high bar on efficacy/safety/convenience for current and future potential competition

                                                Extending Market Leadership
                                                 ▪ 1Q21 U.S. net product sales of $1.35Bn (+15% YoY)
                                         $4.9
                                                 ▪ Sales gains and favorable demographic trends
                              $4.6
                     $4.1
           $3.7
   $3.3
                                                Maximize Growth Initiatives
                                                 ▪ Realize potential in diabetic eye diseases
                                                 ▪ Initiating DTC to drive disease awareness

   2016    2017      2018     2019       2020

      U.S. Net Product Sales, $Billion          Focusing on the Science
                                                 ▪ Explore high-dose formulation for less frequent dosing
  #1 prescribed anti-VEGF
            treatment                            ▪ Pursue gene therapy and other novel approaches
40+ million doses administered
          since launch

                                                                                                            6
DUPIXENT®: STRONG GROWTH TRAJECTORY

                                                                                  Broad-based growth across all
                                                                                  approved indications
       +48% worldwide sales growth in 1Q21 vs. 1Q20
                                                                                  Significant market opportunities
                 U.S.      ROW
                                                                                  support future growth
                                                                    $246   $301

                                      $175
                                                        $221
                                                                    $926
                                                                           $962   Advancing clinical development
               $176
                                      $770
                                                        $851                      program across EIGHT Type 2
               $679                                                               diseases

              1Q20                   2Q20               3Q20       4Q20    1Q21

                                          Net Product Sales*, $Million
                                                                                                                     7
* Sanofi records global net product sales of Dupixent
DUPIXENT®: DRIVING LEVERAGE IN COLLABORATION PROFITABILITY

                                           Antibody Collaboration Share of Profits / (Losses)*
                                                                                         (in Millions)
    $300

    $250

    $200

    $150

    $100

     $50

       $0

     ($50)

    ($100)
             1Q18          2Q18           3Q18           4Q18           1Q19           2Q19           3Q19           4Q19           1Q20           2Q20           3Q20              4Q20   1Q21

             * Share of profits/(losses) are derived from global net product sales of Praluent (up until and including 1Q20), Kevzara, and Dupixent, which are recorded by Sanofi                 8
DUPIXENT & ITEPEKIMAB (ANTI IL-33) COPD PHASE 3s UNDERWAY
Two-pronged approach against COPD

  Dupixent addresses Type 2 COPD
  Achieved prespecified efficacy milestone in interim analysis of
  first Ph3 study
                                                                                                                       Non-Type 2                                                             Type 2
               Eosinophils ≥300/μl
               Both former and current smokers
               2 Ph3 trials ongoing                                                                                                                                                Dupixent or
                                                                                Former Smokers                    Itepekimab only
               Pivotal data expected 2023                                      (70% of COPD patients^)                                                                             Itepekimab
                                                                                                                   ~600K patients
                                                                                                                                                                                  >350K patients
  Itepekimab addresses also non-Type 2 COPD
  Ph2 proof-of-concept data indicates potential benefit in former
  smokers
               No eosinophil restriction                                        Current Smokers                                                                                   Dupixent only
                                                                               (30% of COPD patients^)
               Focus on former smokers
                                                                                                                                                                                  ~150K patients
               2 Ph3 trials initiated
               Pivotal data expected 2024
COPD – Chronic Obstructive Pulmonary Disease
* Dupixent and Itepekimab are developed in collaboration with Sanofi                             This slide contains investigational indications not yet approved by regulatory authorities
^ US, EU and Japan epidemiology estimates, patient populations exclude never                                                                                                                           9
smokers
SUBSTANTIAL PATIENT OPPORTUNITY IN TYPE 2 INFLAMMATORY DISEASES
FOR DUPIXENT®

                                                                                                                                                                                                                     Up to 4M+
                                                                                                                                                                                                                      Eligible
         Atopic                                                                                                                                                                                                      Patients in
        Dermatitis                                      Asthma                        CRSwNP                                2021e                           2022e                   2023+e
                                                                                                                                                                                                                      U.S. by
                                                                                                                                                                                                                       2023
                                                                                                                                                                   Eosinophilic                     Type 2
                                                                                                                                                                   Esophagitis                      COPD
               2.3M*                                     975k*                                90k
                                                                                                                                    Prurigo                              48k                         300k
                                                                                                                                   Nodularis
                                                                                                                                                                     Chronic
                                                                                                                                                                                                    CSsNP
                                                                                                                                         74k                       Spontaneous
                    Since launch, ~215k patients in the U.S.                                                                                                         Urticaria                        130k
                    have been prescribed Dupixent                                                                                                                        308k
                                                                                                                                                                                                  Bullous
                    There remains a substantial opportunity                                                                                                          Chronic                    Pemphigoid
                    for more patients to benefit                                                                                                                    Inducible
                                                                                                                                                                  Urticaria-Cold                       27k

                                                                                                                                                                          25k                 Allergic Fungal
                                                                                                                                                                                              Rhinosinusitis
                  Approved Indications
                                                                                                                                                                                                      11k
                  Potential indications with POC
                  Other investigational uses
                                                           Figures represent U.S. Biologic-eligible target population (all age groups); dates represent expected first submission
CRSwNP – Chronic Rhinosinusitis with Nasal Polyposis;                                                                                                                                This slide contains investigational indications
COPD – Chronic Obstructive Pulmonary Disease;
                                                           *Target population includes age groups that are not currently approved but in clinical development
                                                           Source – Regeneron Internal Epidemiology Data                                                                             not yet approved by regulatory authorities        10
CSsNP – Chronic Sinusitis without Nasal Polyposis
ROADMAP TO LEADERSHIP IN ONCOLOGY
COMPETE, ENHANCE, and EXTEND treatment benefits in monotherapy and combination settings

                                                                COMPETE

                                                                                                    U.S.                 ROW
LEAD in dermato-oncology
    First approved anti-PD-1 in advanced CSCC
                                                                                                            $25                  $23              $32
    Now Approved as first-in-class anti-PD-1 in BCC
                                                                                      $17
                                                                          $13

COMPETE: Non-Small Cell Lung and Cervical Cancers
NSCLC:                                                                                                      $72                  $74
                                                                                                                                                  $69
                                                                          $62         $63
•    Now Approved in 1L PD-L1+ NSCLC
•    Phase 3 study in combination with chemotherapy fully-
     enrolled with interim analysis planned in 2021
Cervical:
                                                                          1Q20      2Q20               3Q20            4Q20                       1Q21
•   Study stopped early due to positive results on overall survival                              Net Product Sales*, $Million
•   Reduced risk of death by 31% compared to chemotherapy                        * Sanofi records net product sales of LIBTAYO outside the U.S.

                    CSCC – Cutaneous Squamous Cell Carcinoma;
                ®
                    BCC – Basal Cell Carcinoma; NSCLC – Non-                                                                                             11
                    Small Cell Lung Cancer
ONCOLOGY STRATEGY: ASPIRE TO COMPETE, ENHANCE, & EXTEND

                   Oncology Opportunity
                                                                                                             COMPETE: LIBTAYO delivers potentially
                                                                                                             ‘best-in-class’ data in tumors responsive to PD-1
                                                                                                             monotherapy (e.g., skin cancers & NSCLC)
                                                                                                                 • Compete in large PD-(L)1 opportunity:
                                                                                                                      o  ~$27Bn, +22% YoY growth^
Patient Benefit

                  ENHANCE
                                                                                                             ENHANCE: Even for PD-1 responsive tumors,
                                                                  EXTEND                                     more than half of patients do not respond
                                                                                                                 •   Enhance responsiveness for these tumors by adding
                                                                                                                     novel therapeutics (e.g., xCD3 & xCD28 Bispecifics)

                  COMPETE
                                                                                                             EXTEND: Most tumor settings have limited
                                                                                                             responses to checkpoint inhibition
                                                                                                                 •   Extend responsiveness for these tumors via addition of
                                     Tumor Types                                                                     novel therapeutics (e.g., xCD3 & xCD28 Bispecifics)

                   ®
                                                                                                                                                                              12
                       ^Based on TTM net product sales data for approved PD-(L)1 agents as of Dec 31, 2020
SIGNIFICANT OPPORTUNITY TO ENHANCE & EXTEND TREATMENT BENEFITS

                                                                                           Number of Cancer Cases Per Year
                                                                        * Breast
                                                                            Lung
                                                                    * Colorectal
                                                                      * Prostate
  Despite the advancements in the field, there are many                Stomach
  cancers that don’t respond to anti PD-1 monotherapy                       Liver
                                                                          Cervix
                                                                    Esophagus
                                                                       * Thyroid
                                                                         Bladder
                                                    * Non-Hodgkin Lymphoma
                                                                   * Pancreatic
                                                                    * Leukemia
  Even for those cancers that are responsive,                             Kidney
                                                                 Endometrium
  many patients unfortunately do not benefit                 Lip & Oral Cavity
                                                                     Melanoma                                                                      Mortality
                                                                         * Ovary
                                                                * Brain & CNS                                                                      Incidence
                                                                      Laryngeal
                                                           * Multiple Myeloma
                                                                                    0          500,000         1,000,000 1,500,000 2,000,000 2,500,000

                  Regeneron’s clinical development pipeline of 12+ candidates has potential to
                  address unmet need in the vast majority of the most prevalent cancer types
              ®                                                                     Source: The Global Cancer Observatory November 2020                        13
                                                                                    * Cancers where anti-PD-1 treatments have limited or no approval
REGENERON ONCOLOGY TOOLKIT LEVERAGES MULTIPLE PLATFORMS TO
CREATE COMBINATORIAL FLEXIBILITY

                                                    Bispecifics

  VelocImmune®        CD3 Bispecifics              Costimulatory                           New Classes of                                        Collaborations
    Antibodies        (to link Killer T Cell to     Bispecifics                              Bispecifics                                        (CAR-Ts; Vaccines)
  (e.g., checkpoint      tumor: Signal 1)             (to provide                        PiGs,        VelociNatorTM,
      inhibitors)                                 synergistic Signal 2)                                 others

                                            PD-1 (LIBTAYO)

            ®
                                                              Our bispecific antibodies are investigational and have not been fully evaluated by regulatory authorities.   14
REGENERON’S VELOCI-BI® APPROACH CAN CREATE, MANUFACTURE, AND
DEVELOP HIGH-QUALITY BISPECIFICS OF ANY DESIRED SPECIFICITY

                                                Tumor                                                   VELOCI-BI®
                                                 Cell
  Killer T                                                                     Killer T
                                              TAA1,TAA2
   Cell                                                                         Cell      VelociGene® and VelocImmune® technologies
                                                                                          are fundamental

   Anti-                                             CD20                      Anti-      • Foundation for Dupixent, Praluent, Libtayo,
                                                    BCMA                                    REGN-EB3 (Inmazeb), REGEN-COV and
   CD3                                                                         CD28         other Regeneron-discovered medicines
                                                    Others:
                                                    MUC16
                                                     EGFR
                                                     PSMA                                 Next-generation VelocImmune® used to
                                                   TAA Heme                               create several distinct classes of bispecifics,
                                                                                          with varying specificity and affinity

                                                                                          Regeneron bispecific approach is unique
         “Signal 1”                                               “Signal 2”
                                                                                          • No linkers or artificial sequences
      T cell activators                                           T cell costims          • Ease of manufacturing using same process as
                                                                                            regular antibodies
                                                                                          • Similar PK to regular antibodies

             ®
                 Costim – CD28-engaging, costimulatory molecule                                                                       15
ODRONEXTAMAB (CD20xCD3): DEEP AND DURABLE RESPONSES

                                                                                                                  American Society of Hematology (ASH) Dec 2020 update:

 • A single bispecific, effective in both indolent                                                 R/R Follicular Lymphoma                          R/R DLBCL (CAR-T naïve)                             R/R DLBCL (post-CAR-T)
   and aggressive lymphomas, including patients
   who failed CAR-Ts                                                                              • ORR=90%, CR=70%                                 • ORR=55%, CR=55%                                   • ORR=33%, CR=21%
                                                                                                  • N=30, doses 5-320 mg                            • N=11, doses 80-320 mg                             • N=24, doses 80-320 mg
 • Off-the-shelf administered in outpatient setting*
                                                                                                  • CRs ongoing for up to                           • CRs ongoing for up to                             • All CRs ongoing for up
 • Robust development plan ahead                                                                    ~3.5 years                                        21 months                                           to 20 months
 • Over 350 patients dosed to date across program
                                                                                                                                Durable CRs: mDoCR not reached for any indication
 • Durable responses (~3.5 years in FL)
 • Acceptable safety profile

                                                                                                                  •   Most frequent Gr ≥3 TEAEs (>10% of patients) included anemia (24.3%; Gr 1–3
                                                                                                                      at baseline in 22%), lymphopenia (20.6%; transient), neutropenia (18.4%;
                                                                                                                      febrile in 2.2%), and hypophosphatemia (18.4%; transient)
                                                                            REGN1979
                                                                                                                  •   Nine patients (6.6%) had to discontinue odronextamab due to a TEAE, including
                                                                    Anti-                   Anti-                     Gr 1 cytomegalovirus infection (n=1), Gr 1 fatigue (n=1); Gr 2 pneumonia (n=1);
                                                                    CD3                     CD20                      Gr 3 hemolysis, fatigue, pneumonia, toxoplasmosis, and TLS (all n=1), plus
      The Ph1 and Ph2 Odronextamab clinical trials                                                                    abscess (n=1; unrelated to study treatment)
      are currently on partial clinical hold. The
      company has submitted a response to the FDA                                                                 •   No patients discontinued odronextamab due to CRS or neurotoxicity
      with the goal of resuming patient enrollment in
      the first half of 2021.
                                                                                                                  •   Odronextamab was administered up to 320 mg weekly without DLTs or
                                                                                                                      reaching MTD; no dose-dependent increase in toxicity was observed

                        R/R – Relapsed/Refractory (heavily pre-treated); DLBCL – Diffuse Large B Cell Lymphoma;       *Patients are hospitalized for observation during step-up dosing and the first QW dose.
                    ®
                        ORR – Objective Response Rate; CR – Complete Response; CRS – Cytokine Release                 This slide contains investigational products not yet approved by regulatory authorities              16
                        Syndrome; TEAE – Treatment-Emergent Adverse Event
REGN5458 (BCMAxCD3): COMPETITIVE ANTI-TUMOR ACTIVITY; POTENTIALLY
REGISTRATIONAL PH2 UNDERWAY IN MULTIPLE MYELOMA

                                                  REGN5458
      Our first BCMAxCD3 bispecific to enter clinic; now in potentially registrational Ph2 dose expansion

                                                                                                                                              Phase 1 ASH Dec 2020 update:

  • Competitive efficacy profile in a heavily                                                                                                              R/R Multiple Myeloma
    pretreated, vulnerable patient population:                                                                                                                N=49*, doses 3-96 mg
                                                                                                                               Efficacy:
       o 100% refractory to anti-CD38 and at
          least triple refractory                                                                                               3-12mg (n=24): ORR=29%, VGPR or better= 25%
       o 67% with prior autologous transplant                                                                                  24-48mg (n=17): ORR=41%, VGPR or better= 41%
       o 31% 70 years or older                                                                                                     96mg (n=8): ORR=63%, VGPR or better= 63%
  • Data shown for all patients at all dose
                                                                                        Anti-                  Anti-
    levels explored (intention to treat analysis)                                       CD3                    BCMA
       o Deep responses across all dose                                                                                         • High and deep response rates: 95% of responders
          levels                                                                                                                  achieved VGPR or better
  • Acceptable safety profile                                                                                                   • Among responding patients with ≥6 months of follow-
       o No Grade 3+ neurotoxicity or CRS                                                                                         up, 83% have ongoing responses for up to 13 months
                                                                                                                                • Responses occur early and improve over time
                                                                                                                                • Acceptable tolerability up to 96mg (dose level 6)

                                                                                                                                       As of 1Q21, Regeneron retained exclusive
                                                                                                                                          rights to the BCMAxCD3 programs
                  *Median of 5 lines of prior systemic therapy, including anti-CD38; patients with primarily
                  medullary and secretory disease
              ®
                  R/R – Relapsed/ Refractory (heavily pre-treated); ORR – Objective Response Rate;                     This slide contains investigational products not yet approved by regulatory authorities   17
                  VGPR – Very Good Partial Response; CRS – Cytokine Release Syndrome
COSTIM COMBINATIONS: ENHANCE AND EXTEND BENEFITS OF CHECKPOINT
INHIBITORS

                                     CD28 COSTIMS IN THE CLINIC (SOLID TUMORS)

 REGN5678 (PSMAxCD28)                       REGN5668 (MUC16xCD28)                                           REGN7075 (EGFRxCD28)

 Evaluating combination with                Evaluating combination with either                              Evaluating combination with
 LIBTAYO                                    MUC16xCD3 or LIBTAYO                                            LIBTAYO

 Prostate Cancer                            Ovarian Cancer (recurrent)                                      Solid tumors, including:
 (metastatic castration-resistant)                                                                               Non-Small Cell Lung Cancer
                                                                                                                 Cutaneous Squamous Cell Carcinoma
                                                                                                                 Colorectal Cancer (microsatellite stable)
                                                                                                                 Triple Negative Breast Cancer

         Combinations of our CD3 and CD28 bispecific antibodies and checkpoint inhibitors offer advantage of simultaneously
         providing multiple signals for activating T cells to kill tumors

         Additional CD3 and CD28 bispecifics for all these tumors are being developed

         Robust combinatorial potential and flexibility to enhance and extend treatment across many different types of cancers

              ®
                                                                  This slide contains investigational products not yet approved by regulatory authorities   18
BROAD COMBINATIONS PIPELINE CONTINUES TO ADVANCE AND GROW

                                                        COMBINATIONS                                                      INDICATIONS                                                    STATUS
                                                                                                                                                                      Resubmit modified study design to
  ONGOING        Odronextamab^ (CD20xCD3)                    +                   LIBTAYO*                                      Lymphoma
                                                                                                                                                                                  FDA^

                   REGN4018 (MUC16xCD3)                      +                   LIBTAYO*                                   Ovarian cancer                                   Dose escalation ongoing

                   REGN5678 (PSMAxCD28)                      +                   LIBTAYO*                                   Prostate cancer                                  Dose escalation ongoing

                        REGN3767 (LAG-3)                     +                   LIBTAYO*                                 Advanced cancers                                  Expansion cohort enrolling

                  REGN5668 (MUC16xCD28)                      +          REGN4018 / LIBTAYO*                                 Ovarian cancer                                                Enrolling

                         REGN6569 (GITR)                     +                   LIBTAYO*                                     Solid tumors                                                Enrolling

                   REGN7075 (EGFRxCD28)                      +                   LIBTAYO*                                     Solid tumors                                                Enrolling

  UPCOMING       odronextamab (CD20xCD3)                     +            B cell/CD28 costim                                      B-NHL                                                   IND filed

                  REGN5458/9 (BCMAxCD3)                      +         Plasma cell/CD28 costim                             Multiple myeloma                                       IND filing in 2021

                                TAAxCD3                      +                   LIBTAYO*                                   Prostate cancer                                       IND filing in 2021

                 odronextamab (CD20xCD3)                     +             Standard of Care                                       B-NHL                                               Initiating in 2021

                  REGN5458/9 (BCMAxCD3)                      +             Standard of Care                                Multiple myeloma                                           Initiating in 2021

      VelocImmune® Antibodies                               Costim BiSpecifics                             CD3 BiSpecifics                                                      Anti-PD-1

             ®
                 * In collaboration with Sanofi                                             This slide contains investigational products not yet approved by regulatory authorities                        19
                 ^ Currently on partial clinical hold
REGEN-COV: FIRST COMBINATION THERAPY TO RECEIVE EUA;
ESTABLISHING VAST CLINICAL PROFILE ACROSS MULTIPLE SETTINGS

In 4Q20, the U.S. FDA granted Emergency Use                                                                                          Net Product Sales
Authorization to the REGEN-COV COVID-19                                                      •       1Q21 Net Product Sales of $439M (U.S. $262M ROW* $177M)
antibody cocktail (casirivimab with imdevimab)                                                        * Roche records net product sales outside the U.S. Regeneron and Roche share gross profits from worldwide sales.

                                                                                                                                       Clinical Updates
                                                                                                 •    Outpatient Study (2067): 2,400mg and 1,200mg doses
                                                                                                      reduce the risk of hospitalization or death by 70%
                                                                                                 •    Prevention Household Contacts (2069a): 1,200mg dose
                                                                                                      reduced the risk of symptomatic infections by 81%
                                                                                                 •    Treatment Trial (2069b): 1,200 mg dose in recently infected
                                                                                                      patients reduced the progression to symptomatic COVID-19
                                                                                                      by 31%, and by 76% after the third day

                                                                                       Upcoming Milestones
        •       FDA decision to update existing EUA with lower 1,200mg dose
        •       FDA decision to expand EUA to include COVID-19 prevention for appropriate populations
        •       Data results of UK RECOVERY trial in hospitalized patients
Casirivimab with imdevimab is an investigational medicine. The safety and
efficacy of this drug candidate are still being evaluated by regulatory authorities.                                                            This project has been funded in whole or in part with Federal            20
                                                                                                                                                funds from BARDA under OT number: HHSO100201700020C
REGEN-COV: ENDURING COMMERCIAL OPPORTUNITY IN BOTH TREATMENT
AND PREVENTION SETTINGS

                                                                                            Targeted Populations                                U.S. Patient Opportunity

                                                                                       ❑   High-risk infected patients
                                                                                       ❑   >65 years                                                           ~40%
                         as Treatment Option                                           ❑   Unvaccinated                                            of infected COVID
                                                                                                                                                patients are at high risk
                                                                                       ❑   Poor responders to vaccines

                                                                                       ❑ Cancer Patients                                             ~2 Million
                                                                                       ❑ Transplant Patients
                      as Prevention Option*                                                                                                                 Chronic
                                                                                       ❑ Autoimmune Diseases
                                                                                                                                                         (Monthly Dose)

          REGEN-COV has the potential to aid millions of patients across multiple treatment and prevention settings

Casirivimab with imdevimab is an investigational medicine. The safety and
                                                                                                         * Regeneron plans to share data with the FDA and request the EUA be   21
                                                                                                         expanded to include COVID-19 prevention for appropriate populations
efficacy of this drug candidate are still being evaluated by regulatory authorities.
EVKEEZA – RARE DISEASE OPPORTUNITY

                                                   Address Unmet Need in Patients with HoFH

                                                   Build Rare Disease Strategy

                  Now Approved

                                                   Apply Cardiometabolic Expertise

                                                              Found that patients with loss-of-function mutations in their ANGPTL3 gene have significantly
                                                              lower levels of key blood lipids, including LDL-C
                                                              Evinacumab was designed to replicate this loss-of-function mutation effect to lower LDL-C in
                                                              patients with HoFH

 HoFH - Homozygous Familial Hypercholesterolemia                                                                                                             22
REGENERON-DISCOVERED, APPROVED AND INVESTIGATIONAL
MEDICINES ACROSS A WIDE AND DIVERSE SET OF DISEASES

 PHASE 1                                                                                            PHASE 2                                                                                      PHASE 3
      REGEN-COV^ (SARS-CoV-2)                              REGN7257 (IL-2Rg)                            REGEN-COV^ (SARS-CoV-2)                     Dupilumab* (IL-4R)                                   REGEN-COV^ (SARS-CoV-2)
      Fianlimab (LAG-3)                                    Pozelimab +                                  Cemiplimab* (PD-1)                          Sarilumab* (IL-6R)                                   Cemiplimab* (PD-1)
                                                           cemdisiran ‡ (C5)
      REGN6569 (GITR)                                                                                   Odronextamab (CD20xCD3)                     REGN1908-1909 (Feld1)                                Dupilumab* (IL-4R)
                                                           REGN5381 (NPR1)
      REGN5093 (METxMET)                                                                                REGN5458 (BCMAxCD3)                         Aflibercept (VEGF Trap)                              Itepekimab* (IL-33)
                                                            ALN-HSD ‡ (HSD17B13)                                                                                                                         REGN5713-5714-5715
      REGN4018 (MUC16xCD3)                                                                              Pozelimab (C5)
                                                           REGN6490 (IL-36R)                                                                                                                             (Betv1)
      REGN5668 (MUC16xCD28)                                                                             Cemdisiran‡ (C5 siRNA)                                                                           Alirocumab (PCSK9)
      REGN5678 (PSMAxCD28)                                                                              Evinacumab (ANGPTL3)                                                                             Fasinumab† (NGF)
      REGN7075 (EGFRxCD28)                                                                              Garetosmab (Activin-A)                                                                           Aflibercept (VEGF Trap)
      Odronextamab (CD20xCD3)                                                                           REGN4461 (LEPR)
      REGN5459 (BCMAxCD3)
      NTLA-2001# (TTR KO CRISPR/Cas9)
                                 INFECTIOUS                SOLID ORGAN                     HEMATOLOGY        IMMUNOLOGY &                         GENERAL                 PAIN             OPHTHALMOLOGY           RARE DISEASES
                                 DISEASES                  ONCOLOGY                                          INFLAMMATORY DISEASES                MEDICINE
 * In collaboration with Sanofi
 † In collaboration with Teva and Mitsubishi Tanabe   ‡
                                                      #
                                                          In collaboration with Alnylam
                                                                                                                       This slide contains investigational products not yet approved by regulatory authorities
                                                                                                                                                                                                                               23
 ^ In collaboration with Roche                            In collaboration with Intellia
EMPOWERING OUR COLLABORATIONS TO ADVANCE THE NEXT GENERATION
OF GENETICS-BASED MEDICINES

                                                                                                                               World leading human sequencing
                                                                                                                                • >1M human exomes sequenced
                                                                                                                                • linked to EHRs
                                                                                                                                • BIG DATA

             VIRAL-BASED                                                       RNAi                                                     CRISPR/Cas9                                     CAR-T & OTHER CELL
            GENE THERAPY                                                   THERAPEUTICS                                                                                                  BASED THERAPIES
 •   RGC helps discover gene                                  •    RGC helps discover new                                  •      First-ever CRISPR-based                        •    Technologies to discover
     targets for hearing loss                                      gene targets                                                   systemic gene therapy (TTR)                         new CAR-T targets
 •   Developing novel ways to                                 •    First-in-class antibody/ RNAi                           •      RGC helps discover new gene                    •    Creating new CARs
     engineer viral-based                                          combinations (e.g., C5)                                        targets                                        •    Novel tumor targeting
     gene therapy to the ear                                                                                               •      Inventing new technologies for                      moieties (e.g., PiG Abs)
                                                                                                                                  “CRISPR-based gene knock-in”

     RGC – Regeneron Genetics Center; EHR – Electronic Health Records; CAR – Chimeric Antigen Receptor; PiG – Peptide in Groove                      All trademarks are the property of their respective owners.   24
LEVERAGING FINANCIAL STRENGTH TO DRIVE GROWTH AND
SHAREHOLDER RETURN

                                                                               Capital Allocation Priorities:
                        1. Invest in our best-in-class R&D capabilities
                        2. Pursue and fund business development opportunities to
                           enable and synergize our R&D capabilities and technologies
                        3. Return cash to shareholders through share repurchases

                 1Q21 Net Cash Position*: $5.1Bn                                               $323Mn in Share Repurchases in 1Q21
                                                                                               ~$1.2Bn remains on new $1.5Bn share repurchase program

*Net Cash Position defined as Cash and Marketable Securities less Long-Term Debt
See reconciliation of net cash to the nearest GAAP measure on slide 28
                                                                                                                                                        25
MULTIPLE POTENTIAL REGULATORY SUBMISSIONS: 2021-2023+

           2021                                                            2022                                                                                         2023+
       REGEN-COV††                    Odronextemab (CD20xCD3)                                         DUPIXENT*                                                Itepekimab (IL-33)*
         COVID-19‡                               B Cell NHL^^                                 Eosinophilic Esophagitis                           Chronic Obstructive Pulmonary Disease

        Fasinumab†                      REGN5458 (BCMAxCD3)                                           DUPIXENT*                                         REGN1908-1909 (Feld1)
      Osteoarthritis Pain^          Relapsed/Refractory Multiple Myeloma             Pediatric Atopic Dermatitis (6 mo-5 yr)                                            Cat Allergy

        Garetosmab                         High-Dose EYLEA                                            DUPIXENT*                                     REGN5713-5714-5715 (Betv1)
             FOP^                                                                      Chronic Inducible Urticaria – Cold                                             Birch Allergy

        DUPIXENT*                                                                                     DUPIXENT*                                         Pozelimab ± cemdisiran+
       Prurigo Nodularis                                                                   Chronic Spontaneous Urticaria                                       C5-mediated diseases

        DUPIXENT*                                                                                                                                                    DUPIXENT*
   Pediatric Asthma (6-11 yr)                                                                                                                              Bullous Pemphigoid
                                                                                                                                                  Chronic Obstructive Pulmonary Disease
         LIBTAYO*                                                                                                                                  Chronic Sinusitis w/o Nasal Polyposis
      2L Cervical Cancer                                New Molecule                  New Indication                                                  Allergic Fungal Rhinosinusitis

           EYLEA                                                                                                                                                     PRALUENT
                                                                * In collaboration with Sanofi
        Q16W in NPDR                                            + In collaboration with Alnylam
                                                                                                                                                                     Pediatric HeFH
                                                                † In collaboration with Teva and Mitsubishi Tanabe
                                                                †† In collaboration with Roche                                                   HeFH – Heterozygous Familial Hypercholesterolemia;
                           LIBTAYO* + chemo                                                                                                      FOP – Fibrodysplasia Ossificans Progressive;
                                                                                                                                                 NPDR – Non-Proliferative Diabetic Retinopathy
                     1L Non-Small Cell Lung Cancer              ^ Partial clinical hold pending review of additional data
                                                                ^^ Partial clinical hold pending changes to clinical protocol
                                                                ‡ Received EUA from FDA for mild to moderate COVID-19 in
                                                                                                                                                                                                           26
                                                                high-risk non-hospitalized patients                             This slide contains investigational products not yet approved by regulatory authorities
KEY UPCOMING MILESTONES (12-18 MONTHS)

   EYLEA: Ph2 data readout for High Dose formulation

   Dupixent
   • Regulatory action in pediatric asthma (6-11 years)
   • Ph3 data readouts for EoE, Prurigo Nodularis, and Chronic Spontaneous Urticaria

   REGEN-COV
   • FDA decision to update existing EUA with lower 1,200mg dose
   • FDA decision to expand EUA to include COVID-19 prevention for appropriate populations

   Libtayo
   • Data anticipated in 1L NSCLC chemo combo

   Odronextamab (CD20xCD3)
   • Continue enrollment in potentially pivotal Phase 2 in NHL
   • Initiate OLYMPIA Phase 3 program, combinations, and subcutaneous formulation

   REGN5458 (BCMAxCD3)
   • Complete enrollment in potentially pivotal Phase 2 in Multiple Myeloma
   • Evaluate combinations with standard of care and novel agents; subcutaneous formulation

   New Bispecifics: Potential first data for MUC16xCD3 and PSMAxCD28

  NSCLC – Non-Small Cell Lung Cancer
  BCC – Basal Cell Carcinoma
  NHL – Non-Hodgkin’s Lymphoma
                                                                        This slide contains investigational products not yet approved by regulatory authorities   27
  EoE – Eosinophilic Esophagitis
RECONCILIATION OF GAAP NET INCOME TO NON-GAAP NET INCOME AND
OF NET CASH POSITION

                                                                  REGENERON PHARMACEUTICALS, INC.
                                                             RECONCILIATION OF NET CASH POSITION (Unaudited)
                                                                              (In millions)

                               *See slide 2 for additional important information regarding non-GAAP financial measures included in this presentation   28
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